docs: def Morrison(Re):
      r'''Calculates drag coefficient of a smooth sphere using the method in
      [1]_ as described in [2]_.
  
      .. math::
          C_D = \frac{24}{Re} + \frac{2.6Re/5}{1 + \left(\frac{Re}{5}\right)^{1.52}}
          + \frac{0.411 \left(\frac{Re}{263000}\right)^{-7.94}}{1
          + \left(\frac{Re}{263000}\right)^{-8}} + \frac{Re^{0.8}}{461000}
  
      Parameters
      ----------
      Re : float
          Particle Reynolds number of the sphere using the surrounding fluid
          density and viscosity, [-]
  
      Returns
      -------
      Cd : float
          Drag coefficient [-]
  
      Notes
      -----
      Range is Re <= 1E6.
  
      Examples
      --------
      >>> Morrison(200.)
      0.767731559965325
  
      References
      ----------
      .. [1] Morrison, Faith A. An Introduction to Fluid Mechanics.
         Cambridge University Press, 2013.
      .. [2] Barati, Reza, Seyed Ali Akbar Salehi Neyshabouri, and Goodarz
         Ahmadi. "Development of Empirical Models with High Accuracy for
         Estimation of Drag Coefficient of Flow around a Smooth Sphere: An
         Evolutionary Approach." Powder Technology 257 (May 2014): 11-19.
         doi:10.1016/j.powtec.2014.02.045.
      '''
      Cd = (24./Re + 2.6*Re/5./(1 + (Re/5.)**1.52) + 0.411*(Re/263000.)**-7.94/(1 + (Re/263000.)**-8)
      + Re**0.8/461000.)
      return Cd